Shoot the puck! As our frenemies north of the border know, pucks can travel at a pretty good clip -- like 100 miles per hour (sorry, 162.5 kilometers an hour) if launched from the stick of an elite hockeyer. So mobile it is.

Same with 4G When 4G launched in 2010, the first consumer devices were often cellular/WiFi hotspots due to them needing a brand new 1st gen 4G LTE baseband modem, in addition to a one for 3G. This resulted in larger, bulkier, power hungry devices (e.g. HTC Thunderbolt in early 2011).

Over the years, the technology improved, shrunk down into a single chip solution, with lower power requirements, enabling really nice mobile devices (e.g LTE-enabled iPhone 5 launched in 2012).

1st gen tech is generally not as good as 2nd, 3rd, nth iteration of it. 5G should be no different in that regard. 5G may make an appearence by end of 2018, but realistically it will be 2019, if not 2020 or later, to deliver the kind of experiences people want from it. It's also trying to do a lot more in the underlying tech like operating in the 10s of GHz (everything now is < 6GHz), large antenna arrays, Massive MIMO, etc.

5G launch devices You're a 5G stickler. A "puck" or "MiFi" style device is exactly what you would expect for an early 5G mobile launch. This is how the first 4G was introduced. Heck, the first commerical 3G device I had my hands on was a PCMCIA card for a laptop